In order to write an article about these sorts of subjects, I am forced to undertake the necessary research to understand the topic in sufficient detail. This is a great way of really getting to understand a topic. Sometimes I may spend several days researching a topic before I feel confident enough to write about it.
When I want to understand a new or emerging technology, I will write a blog about it. So while I may not fully understand the subject matter when I begin, by the time I have investigated it, and wrote a blog about it, my understanding will have progressed enormously.
Writing about a subject, any subject, is a great way to learn about it and understand it, and is one of the key ways by which I develop my knowledge on a huge variety of subjects. I would recommend it to anyone who is keen to extend their knowledge, and has the motivation to do so.